Researchers at Harvard University tested marijuana's main ingredient, delta-tetrahydrocannabinol or THC, in both lab and mouse studies and say their experiments are the first to show THC inhibits the growth of cancer.

Researchers are not certain why THC inhibits tumor growth, but it could be that the substance activates molecules that arrest the cell cycle. THC may also interfere with angiogenesis and vascularization, which promotes cancer growth.

So does this mean all the people at Phish concerts are pinnacles of health?